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Hey Pieter. I also was left a little dumbfounded when the blob and the grinding appeared... however going back to Cura 3.1 everything solved itself and I am a happy camper again. I did upgrade the filament feeder to sanjui as my machine is a very high time used one with more than 9200 hours printing time on it. Try to go back and the problem will sort itself. Maybe there is some filament dust in the feeder. Mine also had the problem that the primary plastic gear (the one on the stepper motor was worn on the inside slipping somewhat) I just recently got myself the solex 3d head with the stainless steel race nozzles and that boosted precision and speed like crazy. Dunno if that comment helps you... Don't despair, I guess we still have the greatest machine on the market!

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This is known bug in 3.2.1. 3 bugs combined to create this issue. There are many work arounds - one of which is to add 256 or more characters in comments at the bottom of the file. one is to downgrade. more details here just a few posts above your post. Cura 3.1 should be fine.

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No, I think it's rather a matter of not enough time to test with all combinations of printers, nozzles, etc. Because of this we're seriously re-evaluating our plan for testing products in the maintenance-state of development (such as currently UM2+). That shouldn't have slipped through.

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Stupid question: how doI get the new firmware into the machine? Couldn't find a "howto"

That's not a stupid question!

You download one of these .hex files to your computer. Then you open up Cura and connect your computer to your printer with a USB cable. Then in Cura you click on your printer's name in the top-right, go to "Manage Printers...". Then click on "Upgrade Firmware" and select "Upload custom firmware". Then you should be able to select the .hex file you downloaded and it'll upload that firmware.

I don't know if it's documented somewhere on this website. If not, there should be some how-to somewhere I guess (though uploading custom firmware is fairly advanced).

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I recently upgraded to the latest firmware on my UM2+ in order to gain the ability to print TPU for quadcopters. It prints great (love this!), but I immediately noticed a big blob on my prints. Switching back to PLA, there's that blob again. Is there a workaround short of waiting for Cura 3.3?

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I recently upgraded to the latest firmware on my UM2+ in order to gain the ability to print TPU for quadcopters. It prints great (love this!), but I immediately noticed a big blob on my prints. Switching back to PLA, there's that blob again. Is there a workaround short of waiting for Cura 3.3?

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I have tried all of the techniques mentioned and I still get the Grinding and Blob at the end of my program. I have upgraded firmware to 3.3.0 on the UM2 and am running Cura 3.4.1 for windows. Any assistance would be greatly appreciated.

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I would add the 512 character comment at the bottom of a gcode file to see if that helps. There is a sample one 3 posts above this post. Are you using cura? S3D? Other? How many characters of comments are at the bottom of the generated gcode file?

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